I will reiterate the posts that spoke of the shotgun's versatility, and it is probably not a good idea to limit that versatility more that you are forced to. That being said my favorite round is 12 gauge, 2 3/4 in, 1 oz of 6 shot. It's done the job on pheasant, rabbit, squirrel, grouse, and an occasional woodcock. It's done a good job, along with conservative shot selection. I'm working through my 60 year old memory cells, which are fuzzy, but I can remember losing a a handful of game, I bet there's more but not a lot. My point is it knocks them down and good. It's probably a little weak for turkey and I never tried waterfowl, and maybe not enough pellets for dove. But in a SURVIVAL situation, I wouldn't waste ammo on dove, and I would probably use a 22 for turkey, maybe a 22 for waterfowl but that's speculation. As far as protection I would give myself the luxury of some buckshot, or a handgun, or a pitbull, or a couple of buddies, but my main strategy would be discretion. In a world turned upside down there are no rematches, you're undefeated or not around anymore. Check how many boxers retired undefeated and you will realize some very, very, tough men still lost a fight in their time. Makes me glad I can blog about situations like this in front of the fireplace and a beer in my hand but not have to live through it.